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Réticulation non-permanente, chimique ou physique, du caoutchouc naturel époxydé : propriétés dynamiques et recyclage

Abstract : Improving rubber recyclability is a major challenge of today’s society. These materials are usually crosslinked through permanent covalent chemistry, which prevents any further modification of the network structure. The aim of this thesis was to design the recyclability up-stream by using non-permanent chemistry for rubber crosslinking. Epoxidized natural rubber (ENR), chosen as the base rubber, is efficiently crosslinked by reaction of dicarboxylic acids on oxirane rings to form ester bonds. On the one hand, the addition of a transesterification catalyst let foresee the obtaining of vitrimer properties. The advantages of this exchangeable chemistry are shown by comparison to lightly permanently crosslinked rubbers that also show stress relaxation and adhesion properties. On the other hand, using a functionalized diacid with a central disulphide function, a certain degree of reprocessability could be obtained, comparable to what was obtained by conventional sulphur vulcanization. A major advantage of the presented diacid chemistry over vulcanization is the non-toxicity towards the environment. Lastly, by grafting long crystallizable fatty acids onto ENR, we synthesized thermoplastic elastomers. Like diacid-crosslinked ENR (chemical network), these physical networks show strain-induced crystallization measured by X-ray diffraction during cyclic tensile tests.
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Lucie Imbernon. Réticulation non-permanente, chimique ou physique, du caoutchouc naturel époxydé : propriétés dynamiques et recyclage. Matériaux. Université Pierre et Marie Curie - Paris VI, 2015. Français. ⟨NNT : 2015PA066427⟩. ⟨tel-01647206⟩

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